6728445687 has 4 divisors (see below), whose sum is σ = 8971260920. Its totient is φ = 4485630456.

The previous prime is 6728445679. The next prime is 6728445739. The reversal of 6728445687 is 7865448276.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6728445687 - 2³ = 6728445679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6728445637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1121407612 + ... + 1121407617.

It is an arithmetic number, because the mean of its divisors is an integer number (2242815230).

Almost surely, 2^6728445687 is an apocalyptic number.

6728445687 is a deficient number, since it is larger than the sum of its proper divisors (2242815233).

6728445687 is a wasteful number, since it uses less digits than its factorization.

6728445687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2242815232.

The product of its digits is 18063360, while the sum is 57.

The square root of 6728445687 is about 82027.1033683380. The cubic root of 6728445687 is about 1887.8678200300.

The spelling of 6728445687 in words is "six billion, seven hundred twenty-eight million, four hundred forty-five thousand, six hundred eighty-seven".